Deep venous thrombosis caused by congenital malformation of the inferior vena cava and heterozygous factor V leiden presenting as venous claudication.

A case of an 18-year-old man with deep venous thrombosis of the lower limbs caused by hypoplasia of the inferior vena cava in combination with heterozygous factor V Leiden is presented. Both anomalies were found when the patient complained of venous claudication in both thighs. Inferior vena cava malformation is a rare condition and may predispose to the development of deep venous thrombosis.